The e500mc core supports the ability to stash into the L1 or L2 cache, however we need to uniquely identify the caches with an id.
We use the following equation to set the various stash-ids:
32 + coreID*2 + 0(L1) or 1(L2)
The 0 (for L1) or 1 (for L2) matches the CT field used be various cache control instructions.
Signed-off-by: Kumar Gala galak@kernel.crashing.org --- cpu/mpc85xx/cpu_init.c | 5 +++++ cpu/mpc85xx/fdt.c | 18 ++++++++++++++++++ cpu/mpc85xx/release.S | 13 +++++++++++++ cpu/mpc85xx/start.S | 8 +++++++- 4 files changed, 43 insertions(+), 1 deletions(-)
diff --git a/cpu/mpc85xx/cpu_init.c b/cpu/mpc85xx/cpu_init.c index 0041a60..16ce82c 100644 --- a/cpu/mpc85xx/cpu_init.c +++ b/cpu/mpc85xx/cpu_init.c @@ -357,6 +357,11 @@ int cpu_init_r(void) while (mfspr(SPRN_L2CSR0) & (L2CSR0_L2FI|L2CSR0_L2LFC)) ;
+#ifdef CONFIG_SYS_CACHE_STASHING + /* set stash id to (coreID) * 2 + 32 + L2 (1) */ + mtspr(SPRN_L2CSR1, (32 + 1)); +#endif + /* enable the cache */ mtspr(SPRN_L2CSR0, CONFIG_SYS_INIT_L2CSR0);
diff --git a/cpu/mpc85xx/fdt.c b/cpu/mpc85xx/fdt.c index de2dcac..5f9aeb1 100644 --- a/cpu/mpc85xx/fdt.c +++ b/cpu/mpc85xx/fdt.c @@ -197,6 +197,15 @@ static inline void ft_fixup_l2cache(void *blob) goto next; }
+#ifdef CONFIG_SYS_CACHE_STASHING + { + u32 *reg = (u32 *)fdt_getprop(blob, off, "reg", 0); + if (reg) + fdt_setprop_cell(blob, l2_off, "cache-stash-id", + (*reg * 2) + 32 + 1); + } +#endif + fdt_setprop(blob, l2_off, "cache-unified", NULL, 0); fdt_setprop_cell(blob, l2_off, "cache-block-size", line_size); fdt_setprop_cell(blob, l2_off, "cache-size", size); @@ -252,6 +261,15 @@ static inline void ft_fixup_cache(void *blob) fdt_setprop_cell(blob, off, "d-cache-size", dsize); fdt_setprop_cell(blob, off, "d-cache-sets", dnum_sets);
+#ifdef CONFIG_SYS_CACHE_STASHING + { + u32 *reg = (u32 *)fdt_getprop(blob, off, "reg", 0); + if (reg) + fdt_setprop_cell(blob, off, "cache-stash-id", + (*reg * 2) + 32 + 0); + } +#endif + /* i-side config */ isize = (l1cfg1 & 0x7ff) * 1024; inum_ways = ((l1cfg1 >> 11) & 0xff) + 1; diff --git a/cpu/mpc85xx/release.S b/cpu/mpc85xx/release.S index a1ae78a..58c2bb9 100644 --- a/cpu/mpc85xx/release.S +++ b/cpu/mpc85xx/release.S @@ -99,6 +99,13 @@ __secondary_start_page: slwi r8,r4,5 add r10,r3,r8
+#if defined(CONFIG_E500MC) && defined(CONFIG_SYS_CACHE_STASHING) + /* set stash id to (coreID) * 2 + 32 + L1 CT (0) */ + slwi r8,r4,1 + addi r8,r8,32 + mtspr L1CSR2,r8 +#endif + #ifdef CONFIG_BACKSIDE_L2_CACHE /* Enable/invalidate the L2 cache */ msync @@ -110,6 +117,12 @@ __secondary_start_page: andis. r1,r3,L2CSR0_L2FI@h bne 1b
+#ifdef CONFIG_SYS_CACHE_STASHING + /* set stash id to (coreID) * 2 + 32 + L2 (1) */ + addi r3,r8,1 + mtspr SPRN_L2CSR1,r3 +#endif + lis r3,CONFIG_SYS_INIT_L2CSR0@h ori r3,r3,CONFIG_SYS_INIT_L2CSR0@l mtspr SPRN_L2CSR0,r3 diff --git a/cpu/mpc85xx/start.S b/cpu/mpc85xx/start.S index 6a86528..7e60e67 100644 --- a/cpu/mpc85xx/start.S +++ b/cpu/mpc85xx/start.S @@ -1,5 +1,5 @@ /* - * Copyright 2004, 2007-2009 Freescale Semiconductor. + * Copyright 2004, 2007-2009 Freescale Semiconductor, Inc. * Copyright (C) 2003 Motorola,Inc. * * See file CREDITS for list of people who contributed to this @@ -102,6 +102,12 @@ _start_e500: * */
+#if defined(CONFIG_E500MC) && defined(CONFIG_SYS_CACHE_STASHING) + /* set stash id to (coreID) * 2 + 32 + L1 CT (0) */ + li r2,(32 + 0) + mtspr L1CSR2,r2 +#endif + lis r2,L1CSR0_CPE@H /* enable parity */ ori r2,r2,L1CSR0_DCE mtspr L1CSR0,r2 /* enable L1 Dcache */